db=LAMBDA_DEBUG
so=LAMBDA_SORT_VERTEX_BY_IN_EDGE_COUNT
co=LAMBDA_IN_EDGE_COALESCED_MEMORY_ACCESS
fu=LAMBDA_FULL_MESSAGE_IN_EACH_SUPERSTEP
pf=LAMBDA_PROFILING
st=LAMBDA_GRAPH_STATISTICS
sh=LAMBDA_SHARE_ONE_MESSAGE_ARRAY
ro=LAMBDA_ROLLING_MESSAGE_ARRAY
